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Finding the Fourth Proportional to 1,130.90, 1,560.23 and 711.10

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Solution

The fourth proportional to 1,130.90, 1,560.23 and 711.10 is: 981.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,130.90 : 1,560.23 = 711.10 : x
  2. Step 2: Convert to fraction form
    1,130.90/1,560.23 = 711.10/x
  3. Step 3: Cross multiply
    1,130.90x = 1,560.23 × 711.10
  4. Step 4: Simplify right side
    1,130.90x = 1,109,471.84
  5. Step 5: Solve for x
    x = 1,109,471.84/1,130.90
  6. Step 6: Final answer
    x = 981.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.